X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=Documentation%2Fsnippets%2Ftransposing-pitches-with-minimum-accidentals-smart-transpose.ly;fp=Documentation%2Fsnippets%2Ftransposing-pitches-with-minimum-accidentals-smart-transpose.ly;h=88ccaff75e8a54b01fd259719df8866e386923b7;hb=e90f0536f9be39ada0bef0aeb0d275dec3b2fb5b;hp=0000000000000000000000000000000000000000;hpb=a8c9e8a7ca320ab0df5fd32e717fd62cd7635ce6;p=lilypond.git

diff --git a/Documentation/snippets/transposing-pitches-with-minimum-accidentals-smart-transpose.ly b/Documentation/snippets/transposing-pitches-with-minimum-accidentals-smart-transpose.ly
new file mode 100644
index 0000000000..88ccaff75e
--- /dev/null
+++ b/Documentation/snippets/transposing-pitches-with-minimum-accidentals-smart-transpose.ly
@@ -0,0 +1,184 @@
+%% DO NOT EDIT this file manually; it is automatically
+%% generated from LSR http://lsr.dsi.unimi.it
+%% Make any changes in LSR itself, or in Documentation/snippets/new/ ,
+%% and then run scripts/auxiliar/makelsr.py
+%%
+%% This file is in the public domain.
+\version "2.14.0"
+
+\header {
+  lsrtags = "pitches"
+
+%% Translation of GIT committish: 70f5f30161f7b804a681cd080274bfcdc9f4fe8c
+doctitlees = "Transportar música con el menor número de alteraciones"
+texidoces = "
+Este ejemplo utiliza código de Scheme para forzar las
+modificaciones enarmónicas de las notas, y así tener el menor
+número de alteraciones accidentales. En este caso se aplican las
+siguientes reglas:
+
+@itemize
+@item
+Se quitan las dobles alteraciones
+
+@item
+Si sostenido -> Do
+
+@item
+Mi sistenido -> Fa
+
+@item
+Do bemol -> Si
+
+@item
+Fa bemol -> Mi
+
+@end itemize
+
+De esta forma se selecciona el mayor número de notas enarmónicas
+naturales.
+
+"
+
+
+%% Translation of GIT committish: 0a868be38a775ecb1ef935b079000cebbc64de40
+  doctitlede = "Noten mit minimaler Anzahl an Versetzungszeichen transponieren."
+  texidocde = "Dieses Beispiel benutzt Scheme-Code, um enharmonische
+Verwechslungen für Noten zu erzwingen, damit nur eine minimale Anzahl
+an Versetzungszeichen ausgegeben wird.  In diesem Fall gelten die
+folgenden Regeln:
+
+@itemize
+@item
+Doppelte Versetzungszeichen sollen entfernt werden
+
+@item
+His -> C
+
+@item
+Eis -> F
+
+@item
+Ces -> B
+
+@item
+Fes -> E
+
+@end itemize
+
+Auf diese Art werden am meisten natürliche Tonhöhen als enharmonische
+Variante gewählt.
+"
+
+
+%% Translation of GIT committish: 4ab2514496ac3d88a9f3121a76f890c97cedcf4e
+  texidocfr = "
+Cet exemple, grâce à un peu de code Scheme, donne la priorité aux
+enharmoniques  afin de limiter le nombre d'altérations supplémentaires.
+La règle appliquable est :
+
+@itemize
+@item
+Les altérations doubles sont supprimées
+
+@item
+Si dièse -> Do
+
+@item
+Mi dièse -> Fa
+
+@item
+Do bémol -> Si
+
+@item
+Fa bémol -> Mi
+
+@end itemize
+
+Cette façon de procéder aboutit à plus d'enharmoniques naturelles.
+
+"
+
+  doctitlefr = "Transposition et réduction du nombrer d'altérations accidentelles"
+
+  texidoc = "
+This example uses some Scheme code to enforce enharmonic modifications
+for notes in order to have the minimum number of accidentals.  In this
+case, the following rules apply:
+
+Double accidentals should be removed
+
+
+B sharp -> C
+
+
+E sharp -> F
+
+
+C flat -> B
+
+
+F flat -> E
+
+
+In this manner, the most natural enharmonic notes are chosen.
+
+"
+  doctitle = "Transposing pitches with minimum accidentals (\"Smart\" transpose)"
+} % begin verbatim
+
+#(define (naturalize-pitch p)
+   (let ((o (ly:pitch-octave p))
+         (a (* 4 (ly:pitch-alteration p)))
+         ;; alteration, a, in quarter tone steps,
+         ;; for historical reasons
+         (n (ly:pitch-notename p)))
+     (cond
+      ((and (> a 1) (or (eq? n 6) (eq? n 2)))
+       (set! a (- a 2))
+       (set! n (+ n 1)))
+      ((and (< a -1) (or (eq? n 0) (eq? n 3)))
+       (set! a (+ a 2))
+       (set! n (- n 1))))
+     (cond
+      ((> a 2) (set! a (- a 4)) (set! n (+ n 1)))
+      ((< a -2) (set! a (+ a 4)) (set! n (- n 1))))
+     (if (< n 0) (begin (set! o (- o 1)) (set! n (+ n 7))))
+     (if (> n 6) (begin (set! o (+ o 1)) (set! n (- n 7))))
+     (ly:make-pitch o n (/ a 4))))
+
+#(define (naturalize music)
+   (let ((es (ly:music-property music 'elements))
+         (e (ly:music-property music 'element))
+         (p (ly:music-property music 'pitch)))
+     (if (pair? es)
+         (ly:music-set-property!
+          music 'elements
+          (map (lambda (x) (naturalize x)) es)))
+     (if (ly:music? e)
+         (ly:music-set-property!
+          music 'element
+          (naturalize e)))
+     (if (ly:pitch? p)
+         (begin
+           (set! p (naturalize-pitch p))
+           (ly:music-set-property! music 'pitch p)))
+     music))
+
+naturalizeMusic =
+#(define-music-function (parser location m)
+   (ly:music?)
+   (naturalize m))
+
+music = \relative c' { c4 d e g }
+
+\score {
+  \new Staff {
+    \transpose c ais { \music }
+    \naturalizeMusic \transpose c ais { \music }
+    \transpose c deses { \music }
+    \naturalizeMusic \transpose c deses { \music }
+  }
+  \layout { }
+}
+